| // Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /** |
| * @assertion It is a compile error if an instance method m1 overrides an |
| * instance member m2 and the type of m1 is not a subtype of the type of m2. |
| * @description Checks that a compile error is produced if m1 is not a subtype |
| * of m2 because their respective optional positional parameter types are not |
| * mutually assignable. |
| * @compile-error |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=nonfunction-type-aliases |
| |
| class A { |
| foo([double? name]) {} |
| } |
| typedef AAlias = A; |
| |
| class C extends AAlias { |
| foo([int? name]) {} |
| } |
| |
| main() { |
| new A().foo(1.0); |
| new C().foo(0); |
| } |
